Don't just listen for positive feedback like "that sounds good." The true signal of intense demand—the kind that builds fast-growing companies—is a physical change in posture. A customer literally leaning forward and asking "How do we get started?" is the ultimate indicator of product-market fit.
Related Insights
A potential customer can logically agree with your framing of their problem yet have no intent to buy. True demand isn't intellectual agreement; it's a palpable force. You must sense the pressure of them actively pushing against a wall. A customer leaning back and nodding is a red flag.
Product-market fit isn't a sudden switch but a palpable shift in momentum. As a founder, you feel the change from pushing against the current (hard selling with little traction) to suddenly being pulled by it (easier sales, inbound interest). This directional change in velocity is the clearest signal that you're onto something.
Product-market fit isn't just growth; it's an extreme market pull where customers buy your product despite its imperfections. The ultimate signal is when deals close quickly and repeatedly, with users happily ignoring missing features because the core value proposition is so urgent and compelling.
Most problems customers describe are "pain points" they won't act on. You can't distinguish these from real, actionable demand ("pull") through interviews alone. The only true test is presenting a viable solution and attempting to sell it. Their reaction—whether they try to pull it from you—is the only reliable signal.
Initially, customers often "round down," focusing on missing features. A key sign of product-market fit is when they start "rounding up"—their faces light up in demos, and they imagine the product's future potential, forgiving current limitations because they believe in the core value.
You've achieved product-market fit when the market pulls you forward, characterized by growth driven entirely by organic referrals. If your customers are so passionate that they do the selling for you, you've moved beyond just a good idea.
When testing new ideas, the right one will provide clear and immediate positive feedback. Tempur-Pedic knew pillows were a winner when 25% of chiropractors in a test mailing immediately placed an order. This strong, early signal indicated product-market fit, unlike other failed tests.
In the early days, Canary's pitch received mixed reactions. However, the strong, visceral "I need this now" response from a few customers was a more valuable signal of product-market fit than getting a polite "that's cool" from everyone. This validates the "10 true fans" principle in B2B.
After experiencing numerous lukewarm responses to failed ideas, the intense, urgent demand from a customer for a successful product becomes an undeniable signal. The contrast between a polite 'maybe later' and a frantic 'how do I get this now?' makes true product-market fit impossible to miss.
A prospect's sudden, intense interest reveals a real need. If they don't convert, it's likely an execution failure—you pitched a confusing product or failed to connect your solution to their problem—not a lack of demand.